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[lib/c] Simplify strncmp()

This functio tried to write too many things in a line, and
this new version maybe has a better performance.

--- a/lib/c/src/strncmp.c

+++ b/lib/c/src/strncmp.c

@@ -4,7 +4,14 @@

 int

 strncmp(const char *s1, const char *s2, size_t n)

 {

-	for (; n && *s1 && *s2 && *s1 == *s2; --n, ++s1, ++s2);

-		;

-	return n ? (*(unsigned char *)s1 - *(unsigned char *)s2) : 0;

+	int c;

+

+	if (n == 0)

+		return 0;

+	while ((c = *s1) != '\0' && c != *s2) {

+		if (--n == 0)

+			return 0;

+		++s1, ++s2;

+	}

+	return (*(unsigned char *) s1 - *(unsigned char *) s2);

 }